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Unread 17-11-2008, 11:54
s1900ahon s1900ahon is offline
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AKA: Scott McMahon
FRC #2468 (Appreciate)
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Join Date: May 2008
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Re: New Speed Controller Announced

Quote:
Originally Posted by Richard McClellan View Post
The specifications table states that the Fan On temperature is 42 degrees Celcius and the Fan Off temperature is 38 degrees Celcius

The last Q&A question states:

So my question is, does the fan come on when you start running a motor, or when the temperature hits 42 degrees, or both?
The fan turns on when you start running the motor.

The fan turns off when you stop the motor, 10 seconds pass, and the temperature is 38 degrees C or less.

The intent of this is to avoid wasting your battery at the start of a match. The fan (ebmpapst 412 FH) is spec'd at 0.8 W (66 mA 12 V). By extension, the fans of 8 motor controllers draw more than half an amp waiting for the match to start. Yeah, nothing compared to what the motors draw during the match, but little bit helps, and it was simple enough to implement (a MOSFET and some software).